Biology Biomolecules KMU 2024
PMDC Verified Question 29 of 142
Lipids, which do not contain fatty acid are:
A
Neutral lipids
B
Phosphatidic acids
C
Steroids
D
Waxes
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Steroids
Concept:

The lipid family is a diverse "catch-all" group defined only by water insolubility, allowing for radically different core structures.

Solution:

  • Most standard lipids (fats, oils, waxes) are built by chemically bonding long, straight fatty acid chains to an alcohol backbone.


  • Steroids (like cholesterol, estrogen, and testosterone) are entirely different. They contain absolutely zero fatty acids.


  • Instead, their structure is based entirely on a rigid, fused skeleton of exactly four interlocking carbon rings (derived from polymerized isoprene units).


Why other options are incorrect:

  • Neutral lipids (triglycerides) & Phosphatidic acids: Directly built using 2 to 3 long fatty acid chains attached to glycerol.


  • Waxes: Contain exactly one very long fatty acid chain.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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